What is the broad band of nerve fibers joining the two cerebral hemispheres called?

• A. Cerebellum
• B. Hippocampus
• C. Corpus Callosum
• D. Thalamus

Answer: (C)

The broad band of nerve fibers joining the two cerebral hemispheres is the corpus callosum. It’s a large bundle of commissural fibers that connect corresponding areas in the left and right cortex, allowing rapid communication between the hemispheres so they can work together on complex tasks like language, planning, and movement. The corpus callosum is white matter, located deep along the top of the brain’s longitudinal fissure.

For context, the cerebellum sits at the back of the brain and coordinates balance and precise movements; the hippocampus, within the temporal lobe, is crucial for forming new memories; and the thalamus acts as a central relay for sensory information heading to the cortex and also influences consciousness. The corpus callosum specifically provides the crucial bridge that enables interhemispheric integration.